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<?xml version="1.0" encoding="UTF-8"?><!--comet.zul{{IS_NOTE Purpose: Description: History: Thu Nov 20 11:28:15 2008, Created by jumperchen}}IS_NOTECopyright (C) 2008 Potix Corporation. All Rights Reserved.{{IS_RIGHT}}IS_RIGHT--><window id="demo" apply="org.zkoss.zkdemo.userguide.DemoWindowComposer">
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<h4>Comet Server Push</h4>
]]></html>See the <toolbarbutton id="target" label="org.zkoss.zkdemo.userguide.CometServerPush" popup="details"/> implementation.
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<pre style='color:#000000;background:#ffffff;'><span style='color:#7f0055; font-weight:bold; '>public</span> <span style='color:#7f0055; font-weight:bold; '>class</span> CometServerPush {
<span style='color:#7f0055; font-weight:bold; '>public</span> <span style='color:#7f0055; font-weight:bold; '>static</span> <span style='color:#7f0055; font-weight:bold; '>void</span> start(<span style='color:#7f0055; font-weight:bold; '>Component</span> info, <span style='color:#7f0055; font-weight:bold; '>Component</span> listbox)
<span style='color:#7f0055; font-weight:bold; '>throws</span> <span style='color:#7f0055; font-weight:bold; '>InterruptedException</span> {
<span style='color:#7f0055; font-weight:bold; '>final</span> Desktop desktop = Executions.getCurrent().getDesktop();
<span style='color:#7f0055; font-weight:bold; '>if</span> (desktop.isServerPushEnabled()) {
Messagebox.show(<span style='color:#2a00ff; '>"Already started"</span>);
} <span style='color:#7f0055; font-weight:bold; '>else</span> {
desktop.enableServerPush(<span style='color:#7f0055; font-weight:bold; '>true</span>);
<span style='color:#7f0055; font-weight:bold; '>new</span> WorkingThread(info, listbox).start();
}
}
<span style='color:#7f0055; font-weight:bold; '>public</span> <span style='color:#7f0055; font-weight:bold; '>static</span> <span style='color:#7f0055; font-weight:bold; '>void</span> stop() <span style='color:#7f0055; font-weight:bold; '>throws</span> <span style='color:#7f0055; font-weight:bold; '>InterruptedException</span> {
<span style='color:#7f0055; font-weight:bold; '>final</span> Desktop desktop = Executions.getCurrent().getDesktop();
<span style='color:#7f0055; font-weight:bold; '>if</span> (desktop.isServerPushEnabled()) {
desktop.enableServerPush(<span style='color:#7f0055; font-weight:bold; '>false</span>);
} <span style='color:#7f0055; font-weight:bold; '>else</span> {
Messagebox.show(<span style='color:#2a00ff; '>"Already stopped"</span>);
}
}
<span style='color:#7f0055; font-weight:bold; '>private</span> <span style='color:#7f0055; font-weight:bold; '>static</span> <span style='color:#7f0055; font-weight:bold; '>class</span> WorkingThread <span style='color:#7f0055; font-weight:bold; '>extends</span> <span style='color:#7f0055; font-weight:bold; '>Thread</span> {
<span style='color:#7f0055; font-weight:bold; '>private</span> <span style='color:#7f0055; font-weight:bold; '>static</span> <span style='color:#7f0055; font-weight:bold; '>Color</span> colors[] = { <span style='color:#7f0055; font-weight:bold; '>Color</span>.blue, <span style='color:#7f0055; font-weight:bold; '>Color</span>.cyan, <span style='color:#7f0055; font-weight:bold; '>Color</span>.green,
<span style='color:#7f0055; font-weight:bold; '>Color</span>.magenta, <span style='color:#7f0055; font-weight:bold; '>Color</span>.orange, <span style='color:#7f0055; font-weight:bold; '>Color</span>.pink, <span style='color:#7f0055; font-weight:bold; '>Color</span>.red,
<span style='color:#7f0055; font-weight:bold; '>Color</span>.yellow, <span style='color:#7f0055; font-weight:bold; '>Color</span>.lightGray, <span style='color:#7f0055; font-weight:bold; '>Color</span>.white };
<span style='color:#7f0055; font-weight:bold; '>private</span> Ellipse2D.<span style='color:#7f0055; font-weight:bold; '>Float</span>[] ellipses;
<span style='color:#7f0055; font-weight:bold; '>private</span> <span style='color:#7f0055; font-weight:bold; '>double</span> esize[];
<span style='color:#7f0055; font-weight:bold; '>private</span> <span style='color:#7f0055; font-weight:bold; '>float</span> estroke[];
<span style='color:#7f0055; font-weight:bold; '>private</span> <span style='color:#7f0055; font-weight:bold; '>double</span> maxSize;
<span style='color:#7f0055; font-weight:bold; '>private</span> <span style='color:#7f0055; font-weight:bold; '>final</span> Desktop _desktop;
<span style='color:#7f0055; font-weight:bold; '>private</span> <span style='color:#7f0055; font-weight:bold; '>final</span> <span style='color:#7f0055; font-weight:bold; '>Component</span> _info;
<span style='color:#7f0055; font-weight:bold; '>private</span> <span style='color:#7f0055; font-weight:bold; '>final</span> Listbox _listbox;
<span style='color:#7f0055; font-weight:bold; '>private</span> <span style='color:#7f0055; font-weight:bold; '>int</span> _width = 150;
<span style='color:#7f0055; font-weight:bold; '>private</span> <span style='color:#7f0055; font-weight:bold; '>int</span> _height = 150;
<span style='color:#7f0055; font-weight:bold; '>private</span> WorkingThread(<span style='color:#7f0055; font-weight:bold; '>Component</span> info, <span style='color:#7f0055; font-weight:bold; '>Component</span> listbox) {
_desktop = info.getDesktop();
_info = info;
_listbox = (Listbox) listbox;
}
<span style='color:#7f0055; font-weight:bold; '>public</span> <span style='color:#7f0055; font-weight:bold; '>void</span> run() {
<span style='color:#7f0055; font-weight:bold; '>try</span> {
<span style='color:#7f0055; font-weight:bold; '>while</span> (<span style='color:#7f0055; font-weight:bold; '>true</span>) {
<span style='color:#7f0055; font-weight:bold; '>if</span> (_info.getDesktop() == <span style='color:#7f0055; font-weight:bold; '>null</span>
|| !_desktop.isServerPushEnabled()) {
_desktop.enableServerPush(<span style='color:#7f0055; font-weight:bold; '>false</span>);
<span style='color:#7f0055; font-weight:bold; '>return</span>;
}
Executions.activate(_desktop);
<span style='color:#7f0055; font-weight:bold; '>try</span> {
((<span style='color:#7f0055; font-weight:bold; '>Image</span>) _info).setContent(paint());
} <span style='color:#7f0055; font-weight:bold; '>finally</span> {
Executions.deactivate(_desktop);
}
Threads.sleep(1000);
}
} <span style='color:#7f0055; font-weight:bold; '>catch</span> (<span style='color:#7f0055; font-weight:bold; '>InterruptedException</span> ex) {
<span style='color:#7f0055; font-weight:bold; '>System</span>.out.println(<span style='color:#2a00ff; '>"The server push thread interrupted"</span>);
}
}
<span style='color:#7f0055; font-weight:bold; '>public</span> <span style='color:#7f0055; font-weight:bold; '>void</span> init(<span style='color:#7f0055; font-weight:bold; '>int</span> size) {
<span style='color:#7f0055; font-weight:bold; '>if</span> (size == 60)
size = 8;
<span style='color:#7f0055; font-weight:bold; '>else</span> <span style='color:#7f0055; font-weight:bold; '>if</span> (size == 40)
size = 12;
<span style='color:#3f7f59; '>// an array of type Ellipse2D.Float</span>
ellipses = <span style='color:#7f0055; font-weight:bold; '>new</span> Ellipse2D.<span style='color:#7f0055; font-weight:bold; '>Float</span>[size];
<span style='color:#3f7f59; '>// a double array initialized to the length of the ellipses array</span>
esize = <span style='color:#7f0055; font-weight:bold; '>new</span> <span style='color:#7f0055; font-weight:bold; '>double</span>[ellipses.length];
<span style='color:#3f7f59; '>// a float array initialized to the length of the ellipses array</span>
estroke = <span style='color:#7f0055; font-weight:bold; '>new</span> <span style='color:#7f0055; font-weight:bold; '>float</span>[ellipses.length];
}
<span style='color:#7f0055; font-weight:bold; '>public</span> <span style='color:#7f0055; font-weight:bold; '>void</span> getRandomXY(<span style='color:#7f0055; font-weight:bold; '>int</span> i, <span style='color:#7f0055; font-weight:bold; '>double</span> size, <span style='color:#7f0055; font-weight:bold; '>int</span> w, <span style='color:#7f0055; font-weight:bold; '>int</span> h) {
esize[i] = size;
estroke[i] = 1.0f;
<span style='color:#7f0055; font-weight:bold; '>double</span> x = <span style='color:#7f0055; font-weight:bold; '>Math</span>.random() * (w - (maxSize / 2));
<span style='color:#7f0055; font-weight:bold; '>double</span> y = <span style='color:#7f0055; font-weight:bold; '>Math</span>.random() * (h - (maxSize / 2));
ellipses[i].setFrame(x, y, size, size);
}
<span style='color:#7f0055; font-weight:bold; '>public</span> BufferedImage paint() {
<span style='color:#7f0055; font-weight:bold; '>int</span> size;
<span style='color:#7f0055; font-weight:bold; '>try</span> {
size = <span style='color:#7f0055; font-weight:bold; '>Integer</span>.parseInt(_listbox.getSelectedItem().getLabel());
} <span style='color:#7f0055; font-weight:bold; '>catch</span> (<span style='color:#7f0055; font-weight:bold; '>NumberFormatException</span> e) {
size = 20;
}
init(size);
<span style='color:#3f7f59; '>// fills the ellipses array with Ellipse2D.Float objects</span>
<span style='color:#7f0055; font-weight:bold; '>for</span> (<span style='color:#7f0055; font-weight:bold; '>int</span> i = 0; i < ellipses.length; i++) {
ellipses[i] = <span style='color:#7f0055; font-weight:bold; '>new</span> Ellipse2D.<span style='color:#7f0055; font-weight:bold; '>Float</span>();
<span style='color:#3f7f59; '>// gets location for each ellipse with the given random size</span>
getRandomXY(i, size * <span style='color:#7f0055; font-weight:bold; '>Math</span>.random(), _width, _height);
}
BufferedImage bi = <span style='color:#7f0055; font-weight:bold; '>new</span> BufferedImage(_width, _height,
BufferedImage.TYPE_INT_RGB);
Graphics2D g2 = bi.createGraphics();
g2.setBackground(<span style='color:#7f0055; font-weight:bold; '>Color</span>.BLACK);
g2.clearRect(0, 0, _width, _height);
g2.setRenderingHint(RenderingHints.KEY_ANTIALIASING,
RenderingHints.VALUE_ANTIALIAS_ON);
<span style='color:#3f7f59; '>// sets the color and stroke size and draws each ellipse</span>
<span style='color:#7f0055; font-weight:bold; '>for</span> (<span style='color:#7f0055; font-weight:bold; '>int</span> i = 0; i < ellipses.length; i++) {
g2.setColor(colors[i % colors.length]);
g2.setStroke(<span style='color:#7f0055; font-weight:bold; '>new</span> BasicStroke(estroke[i]));
g2.draw(ellipses[i]);
}
g2.dispose();
<span style='color:#7f0055; font-weight:bold; '>return</span> bi;
}
}
}
</pre>
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<tab id="demoView" label="Demo"/>
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<attribute name="value"><![CDATA[
<zk>
<style dynamic="true">
.comet-news {
color: #0A94F3;
}
</style>
<window> Please press the "Start" button to see the demo "Comet Server Push".
<button label="Start" onClick="org.zkoss.zkdemo.userguide.CometServerPush.start(info, listbox)"/>
<button label="Stop" onClick="org.zkoss.zkdemo.userguide.CometServerPush.stop()"/>
<separator/>
<hbox>
Change Maximum Diameter:
<listbox id="listbox" rows="1" mold="select" onSelect="">
<listitem label="20" selected="true"/>
<listitem label="40"/>
<listitem label="60"/>
</listbox>
</hbox>
<image id="info" width="150px" height="150px"/>
</window>
</zk>
]]></attribute>
</textbox>
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<button id="tryBtn" label="Try me!"/>
<button id="reloadBtn" label="Reload" height="18px"/>
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